Run pub tests against older versions of barback.

third_party/pkg/barback-0.13.0/test/package_graph/get_all_assets_test.dart

Index: third_party/pkg/barback-0.13.0/test/package_graph/get_all_assets_test.dart
diff --git a/pkg/barback/test/package_graph/get_all_assets_test.dart b/third_party/pkg/barback-0.13.0/test/package_graph/get_all_assets_test.dart
similarity index 77%
copy from pkg/barback/test/package_graph/get_all_assets_test.dart
copy to third_party/pkg/barback-0.13.0/test/package_graph/get_all_assets_test.dart
index 08da238cc34b414c4c5e24d4c4b64008870d5e63..7cadbdfb17b61b6d67340de4278bd4a0a240863b 100644
--- a/pkg/barback/test/package_graph/get_all_assets_test.dart
+++ b/third_party/pkg/barback-0.13.0/test/package_graph/get_all_assets_test.dart
@@ -4,9 +4,6 @@
 
 library barback.test.barback_test;
 
-import 'dart:async';
-
-import 'package:barback/barback.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../utils.dart';
@@ -77,24 +74,4 @@ main() {
       isTransformerException(equals(BadTransformer.ERROR))
     ]));
   });
-
-  // Regression test.
-  test("getAllAssets() is called synchronously after after initializing "
-      "barback", () {
-    var provider = new MockProvider({
-      "app|a.txt": "a",
-      "app|b.txt": "b",
-      "app|c.txt": "c"
-    });
-    var barback = new Barback(provider);
-    barback.updateSources([
-      new AssetId.parse("app|a.txt"),
-      new AssetId.parse("app|b.txt"),
-      new AssetId.parse("app|c.txt")
-    ]);
-
-    expect(barback.getAllAssets().then((assets) {
-      return Future.wait(assets.map((asset) => asset.readAsString()));
-    }), completion(unorderedEquals(["a", "b", "c"])));
-  });
 }